ucs2.h: remove unused variable
ucs2.h: remove unused variable

The const uint16_t pointer is not used since now the two bytes of the
UCS-2 chars are checked to know if is the termination of the string.

Signed-off-by: Javier Martinez Canillas <8fdf2abf85d34ea8f3f979ef25dc1f25d94aca29@redhat.com>

rhinstaller/efivar,rhinstaller/efivar,vathpela/efivar-devel,rhboot/efivar,rhboot/efivar